text: #include <nan.h>
  #include <stdexcept>
  #include "custom_importer_bridge.h"
  #include "create_string.h"
  
  SassImportList CustomImporterBridge::post_process_return_value(v8::Local<v8::Value> returned_value) const {
    SassImportList imports = 0;
    Nan::HandleScope scope;
  
    if (returned_value->IsArray()) {
      v8::Local<v8::Array> array = returned_value.As<v8::Array>();
  
      imports = sass_make_import_list(array->Length());
  
      for (size_t i = 0; i < array->Length(); ++i) {
        v8::Local<v8::Value> value = Nan::Get(array, static_cast<uint32_t>(i)).ToLocalChecked();
  
        if (!value->IsObject()) {
          auto entry = sass_make_import_entry(0, 0, 0);
          sass_import_set_error(entry, "returned array must only contain object literals", -1, -1);
          continue;
        }
  
        v8::Local<v8::Object> object = value.As<v8::Object>();
  
        if (value->IsNativeError()) {
          char* message = create_string(Nan::Get(object, Nan::New<v8::String>("message").ToLocalChecked()));
  
          imports[i] = sass_make_import_entry(0, 0, 0);
  
          sass_import_set_error(imports[i], message, -1, -1);
        }
        else {
          imports[i] = get_importer_entry(object);
        }
      }
    }
    else if (returned_value->IsNativeError()) {
      imports = sass_make_import_list(1);
      v8::Local<v8::Object> object = returned_value.As<v8::Object>();
      char* message = create_string(Nan::Get(object, Nan::New<v8::String>("message").ToLocalChecked()));
  
      imports[0] = sass_make_import_entry(0, 0, 0);
  
      sass_import_set_error(imports[0], message, -1, -1);
    }
    else if (returned_value->IsObject()) {
      imports = sass_make_import_list(1);
      imports[0] = get_importer_entry(returned_value.As<v8::Object>());
    }
  
    return imports;
  }
  
  Sass_Import* CustomImporterBridge::check_returned_string(Nan::MaybeLocal<v8::Value> value, const char *msg) const
  {
      v8::Local<v8::Value> checked;
      if (value.ToLocal(&checked)) { 
        if (!checked->IsUndefined() && !checked->IsString()) {
          goto err;
        } else {
          return nullptr;
        } 
      }
  err:
      auto entry = sass_make_import_entry(0, 0, 0);
      sass_import_set_error(entry, msg, -1, -1);
      return entry;
  }
  
  Sass_Import* CustomImporterBridge::get_importer_entry(const v8::Local<v8::Object>& object) const {
    auto returned_file = Nan::Get(object, Nan::New<v8::String>("file").ToLocalChecked());
    auto returned_contents = Nan::Get(object, Nan::New<v8::String>("contents").ToLocalChecked()).ToLocalChecked();
    auto returned_map = Nan::Get(object, Nan::New<v8::String>("map").ToLocalChecked());
    Sass_Import *err;
  
    if ((err = check_returned_string(returned_file, "returned value of `file` must be a string")))
      return err;
  
    if ((err = check_returned_string(returned_contents, "returned value of `contents` must be a string")))
      return err;
  
    if ((err = check_returned_string(returned_map, "returned value of `returned_map` must be a string")))
      return err;
  
    char* path = create_string(returned_file);
    char* contents = create_string(returned_contents);
    char* srcmap = create_string(returned_map);
  
    return sass_make_import_entry(path, contents, srcmap);
  }
  
  std::vector<v8::Local<v8::Value>> CustomImporterBridge::pre_process_args(std::vector<void*> in) const {
    std::vector<v8::Local<v8::Value>> out;
  
    for (void* ptr : in) {
      out.push_back(Nan::New<v8::String>((char const*)ptr).ToLocalChecked());
    }
  
    return out;
  }
  